As @Rikardt pointed out, this could be an issue with Apple changing the default cookie SameSite. I created another post about it here with a sample app: https://developer.apple.com/forums/thread/765199 Hoping Apple will have a workaround, as I cannot change what the server does (Salesforce in my case).

Is the cookie not there, or is it there but with the wrong SameSite value? It seems in iOS18, the default SameSite value is now Lax instead of None if the server doesn't set it. I opened another forum post about it here https://developer.apple.com/forums/thread/765199 and contacted Apple support. Hoping Apple will have a workaround, as I cannot change what the server does (Salesforce in my case).

Oof, a month and no workarounds yet? I reached out to Apple support about this issue and they directed me to the forums, so I made another post about it here https://developer.apple.com/forums/thread/765199 and contacted Apple support. Hoping Apple will have a workaround, as I cannot change what the server does (Salesforce in my case).

Here are some other posts of what may be the same issue. Hoping Apple will fix this or provide a workaround. https://developer.apple.com/forums/thread/762983?login=true&page=1#806975022 https://developer.apple.com/forums/thread/761938?answerId=806007022&page=1#806998022 https://developer.apple.com/forums/thread/762538?page=1#807002022